Engine equipment for air-brake apparatus



Egualizz'zjg Reservoir 2 Sheets-Sheet .1

Filed June 5. 1926 M. E. HAMILTON ET AL ENGINE EQUlPMENT FOR AIR BRAKE APPARATUS ELI/wily Pasztian Nom-'9 1926.

Main Reser//ol'r Pipe Equalz'zy Reservoir Bra/fe Pipe Lap P0z`on & n. mm

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P .W e m .Uf m n R m n .I r a M B ATTORN EY Patented Nov. 9, 1926.

MAURICE E. HAMILTON, OF PAWTUCKET, RHODE TSLAND, AND EDWARD I?. ILSN, p

i OE EAST ORANGE, NEW JERSEY, ASSGNORS TO AUTOMATTC STBJAGHT ATR BRAKE COMLANY, OF WILMAINGTON, DELAWARE, A GQR-PORATION OF DELAWARE.

ENG-INE EQUIPMENT FOR .AIR-BRAKE APPARATUS.

Application filed June 3,

This invention relates to certain improvements in that type of apparatus shown in the applicati-on filed by Spencer G. Neal, February 26, 1925, Serial No. 11,775.v That application discloses a brakepipe compensating valve which will be operative in the lap position of the engineers brake valve and which will be ineffective as a feed Valve or compensating valve in all other positionsV of the said brake valve. l Y

The object of this invention is to provide a compensating valve which will be positive and certainin its operation.

In the drawings: Fig. 1 is a diagrammatic view partly in section of certain portions of the standard lVestinghouse ET equipment with the invention embodied therein, the engineers brake valve being shown in ruiming posi'- tion;

Fig. 2 a view similar to Fig. 1 showing the engineers brake valve in lap position;

Fig. 3 a longitudinal `vertical sectional view of the compensating valve showing .the parts in the positions they will assume with the engineers brake valve in running position;

Fig. e a view similar toFig. 3 showing the parts in the positions they wi-ll assume with the engineers brake valve in lap position; and

Fig. 5 a detail sectional view of a portion of the compensating valve with the parts in the positions they will assume with the engineersbrake valve in service position.

Referring to the various parts by numerals, 1 designates a standard Westinghouse automatic brake valve as used with `the `Westinghouse ET engine equipment, said valve being illustrated diagrammatically in Figs. 1 and 2. 2 designates the rotor of the engineers brake valve and 3 the handle for manipulating the rotor in the usual manner. 41; designates the equalizing reservoir which is connected to the brake valve in the usual manner. 8 designates the pipe leading to the main reservoir and 9 designates the usual automatic feed valve. 1() designates the brakel pipe and 11 the compensating valve. The equalizing reservoir lis connected to the usual port in the brake valve by pipe 13. The feed valve is connectedv to the `main reservoir pipe by a pipe connection 14, the opposite side ofsaid feed valve being con- 1926i serial No. 113,463.

nected to the usual port in the brake valve by a pipe 15. The engin'eers brake valve is operated vprecisely as in the standard lVestinghouse ET equipment and it is thought to be unnecessary to more particularly describe it'herein. They compensating valve, hereinafter described, takes the'y 'lacef and 19, the casting 18 vbeing in the form ot a ring clamped between the end castings 17 and 19. Between the castings Hand y18 is arranged a transverse brake pipe diaphragm 20 and between the castings 18 and 19 is arranged a transverse equalizing reservoir diaphragm 21. 1n the casting 17 above thev diaphragm 20 is formed a brakepipe chamber 22. In the casting 19 below the diaphragm 21 is formed-an equalizing reservoirchamber 23, and between the diaphragms 20 and 21 is formed an atmospheric chamber24. The ring 18 serves to space the diaphragms 2O and 21 'from each other and to form the atmospheric chamber.v This chamvber is open to atmosphere through-the port 25 `formed through they ring 1S.` The two 'diaphragms arecentrally supported by rigid I structuresy 26 and 26a. The diaphragms and their central supporting structures are pressed 'toward each other by the opposing pressures in chambers 22 and 23 `so that the diaphragms move together. The structure 26a is formed with downwardly extending lugs which Contact with the upper surface of the central portion 26 and hold said structures spaced apart to form the channel 30 which is open around its margin into the atmospheric chamber 24. It will, of course,

Vbe understood thatthe centraldiaphragm supporting structure may be of any suitable construction.k `Stops 27,- limit the upward movement of the diaphragms and stop 28 limits the downward movement-thereof so that. thesaid diaphragms `will have onlyy a limited up-and-down movementjin respense' to variations in pressures in' the chambers 22 and 23.` The central rigid portion 26a of the fllialvohragm 2O is formed with a largezcentralnbore 29 Whiehopens at its lower' end into theehannel formed between the parts 26 and 26, so that the lower end of saidvbore is in .dire-et communication With the atmospheric ehainber 24. The upn per end of the bore 29 opens into the brake pipe chamber 22 and is formed with a valve seat 3l. screwed a Cap 32 which fornisa supply valve chamber 33. This Chamber is inv communieation with the Vbraille pipe chamber 22 through a large central Vpassage 34. rIhis passage is provided with abushing 35, the upper end of which `forms. a valveseat 36. A brake pipe vent valve 37 is adapted to v.fit tightly on the' valve seat 3l, and ya brake fpipe supply valve 38 isadapted toiitti'gliton valveseat. Thel tivo valves 37 and "f when said structure moves downwardly independently of theA valves. YA spring 4l eoniined between .the cap 32 and the valve 38 normally holds said valve seated. Chainber 22 is connected to.the.brake pipe through a pipe connection 43. .The` equalizing reservoir ehainberi?) is eonneeted to the equal,- izing reservoir through passage 44and pipe Connection 45. Interposedbetiveen therentral .structure 25 and the` lower Wall of the equalizing reservoir chamber 23 isa spring 42 which normally tends -vto holdthe valve seat 3l in Contact with the valve'?. The

diaphragm structure is moved downwardly against the tension of spring 42.

' A. vmain ,reservoir eut-off valve 45 oontrols Communication ybetweenthe inai-n reservoirand the chainber above the brake pipevsupply valve 88. This cut-ofi valve comprises a casing 47 preferably east inte'- gral With the-casting 1 9 :and provided With an internal annular bushing 4S. The 10W- er portion of the bushing forms a seatfor a slide valve .49 which is operatively oonneeted to a piston 50 operating in acharnber Aformed in the easing 47,' said piston servi'ng'fas a movable abutment separating amain reservoir chamber 51 from a lsup-(ple.- mentallreservoir chamber .52. A spring l5,3 tendsto hold the valve 49 in its inner position, in Whichpositiongthe saidvalve l(nor-iris a port 54. Port 54`leadsinto a `Channel saidichannel being connected to ehan'lber 33 bya passage. ATheinain reservoi'rpeham; bef .51. 1S @wasted t@ the wie reeel dir pipe `Srpby a pipey 57. The' supplenien al main reservoir Chambery-521s eonnegted-to y the'lor'alna vilveby apipev `Main reserf voir Vpiressere ispresent Ain Cha ber ilwat alltim 's Bia I ifp 's eiitdi'e ailier '52 'wligfiftle engiieerls brake On the top ofthe castingvl is valve yis in lap position, linfwhi oh position el' the said valve pipe 58 is connected to the main reservoir chamber of said valve. (See Fig. 2.) -When the main reservoir pres'- sure is balanced on opposi-te sides of. the piston 50 the springe?) Will force the valve to its open position thereby opening coininw nieationbetvveentheinain reservoir and the chamber v33. When the engineer"s brake valve is placed in running position, as illustrated in Fig. lia port r5.9 in the rotor 2 of said valve will Connect the port 60 to the atmospheric port 6l ofthe said bra-ke valve. Inthis position ofthe engineers brake valve the pipe 58 Willbe eonnecte'dto atmosphere so that the airin chamber V52 Will flow to atmosphere l through the .engineerls brake valve; The highinain reservoir pressur in eharnber 5l Will vforce lthe pistonV and the valve 49 inwardly', compressing 'spring 53 andelosingthe port'54. This Willpeutoff the nia'in lreser'v'oir freni Chamber f' 33 above the 'brake pipe supply valve 38 and thus render the compensating valve'inoperative and ineffective las a brake pipe feed Va-lveso longas the engineersbrake valve remains in running position. In both service andernerrgeniey `positions of the'bralre valvefport 59 1s lso arranged, by suitable elongation, to maintain communica-tion between ports (i0 and. 6 1 thereby vrendering fthe compensating valve inoperative as abrake pipe feed valve during theservice andeinergeney positions of the brake valve, as ivell as in the running position. In the lap position of the engineers brake valve the compensating valve Will operate to maintain the brake pipe pressure substantially equal'to the equalizing reservoir pressure which Was established by the servieeoperationof the engineers brake valve. TWhen the engineers bralre valve is returned to running position, which WillA eonneetlthe pipe 58 tothe port l'ythe pressure in Achamberl will again ymove the eutioivalve to close port 54 and Vthereby .out oi the main Vreservoir from chamber 33.

Operation: The charging of the rbrake pipe is caused, as is Well lniownin present braking` systems of the standard type, by placing the engineers valve in the full re# lease positionin order quickly to charge the brake pipe; said engineersvalve being plaeed atthe runni g position, asin present practice, as Asoon` K s the desired inaniniuin brake pipe pressure'hasbeen obtained. The brake pipe having'thus been charged tothe reflui-red prees-maand .the equalizieg reserver-ealseibeas Charged' to .an equality with the brake pipe pressnre,v the result ivill `be that the 'pressure 1 in the equaligingreservoir Chamber' 23, which is .Gemme Wi. l@ .the feqllezies' rS..L1VOr 4r, Wil bethe 1 e as the .brake ne pressure the bras@ eine Chamber- Qef ,the @we wenn" Yell', Sad. Chamber' 22 being'in dir/eeAVV munication with the brake pipe through the pipe lilith the pressure as just` described, vin order to make a reduction'ot the brale pipe pressure the brakev yalye is L placed i the service pos tion, thereby releasing air l'r in the equa-lining reservo'r to the atmosphere to any desired amount, and thus. through pipe releasing pr-ssure from the equalizing chamber 23 of the compensating' valve below the pressure in the brake pipe chamber 22 ot said compensating valve.V The result of this change of pres ure will be to allow the excess pressure in chamber 22 on the upper side ot diaphragm 20 to lower the diaphragms and the parts connected therewith to the position shown in W thus opening a passage around. the Valve 3? to release brake pipe air through tie chamber 2a and port 25 to atmosphere. lhen the brake pipe pressure in the brake pipe chamber 22 has hus been reduced substantially to the reduced or established pressure in equalizing reservoir chamber 23, said diaphragms and the parts carried thereby will move upward until the seat 8l engages the valve 37, thus cutting oil further escape of brake pipe air. lt the engineers brake Valve be now vplaced in lap position, as shown in Fig. 2, pipe 58 will be connected through port and a small port 62 in the rotor 2, to the main reservoir chamber of the brake valve. Main 'eseryoir air may, therefore, flow into chamber 52 and equalize with the pressure in chamber 5l. rlhe spring,r 53 will thereupon Jforce the valve 49 to its open position and establish communication between the main reservoir and the chamber 33v above the supply Valve The compensating valve is now eli'ective as a brake pipe feed valve and its operation will be dependent upon the differences in pressures in. the brake pipe chamber 22 and in the equalizing reservoir .chamber 28. Should the pressure in chamber be reduced by reason ot' brake pipe leakage, the superior pressure in the equalizing reservoir chamber 23 will move the diaphragm and the valves 37 and 38 upwardly. 'Allhis operation will open the supply valve 38,' as shown in Fig. 4, and permit main reservoir air to tlow from chamber 33 past valve 38 Yinto the brake pipe chamber 22 and .thence to the vbrake pipe through pipe 4:3, Se lon 0' as the brake pipe ervoir pressure the supply valve 38 will be held open. is the brake pipe leakage is press-.re remains below the equalizing res-Y atl the rate of the leakage. Of course it the y leakage should stop the brake pipe pressure would be immediately built up to ,a sub stantial equality withthe cqu'alizng reser-y voir pressure and the supplyyalve would v lWhat we claim .lsz l y l. An air brake apparatus comprising a brake pipe, an engineers brake Valve, a main. reservoir, an equalizing reservoir, a brake pipe compensating valve subject to brake pipe pressure opposed to the pressure of the equalizing reservoir and controlling communication between the brake pipe and atmosphere and between the main reservoir and the brake pipe, the equalizing reservoir pressure tendingto open communication between the main reservoir and the brake pipe and the brake,y pipe pressure,

tending to open communication between the brake pipe and atmosphere, a cut-oli Valve controlling communication between the main reservoir and the compensating valve,

means whereby the engineers Valve in runl ning, service and emergency positions will permit main reservoir pressure to close the cut-oil' Valve, means whereby the engneers brake Valve in lap position will equalize main reservoir pressure on opposite sides ol the cut-off Valve, and a spring normally tending to move the cut-oilvalve to open positlon. f Y

2. An air brake apparatus comprising a main reservoir, an equalizing reservoir, a brake lpipe compensating` valve subject to brake pipe pressure opposed to the pressure of the equalizing reservoir` and controlling communication between the brake pipe and atmosphere and between the main reservoir and the brake pipe, the equalizing reservoir pressure tending to open communication betweenlthe main reservoir and the brake pipe and the brake pipe pressure tending to open communication between `the brake pipe andV atmosphere, a cut-on valvel controlling' communication between the main reservoirk and the compensating ifalye, means whereby the engineers valve in running, service and emergency positions will permit main reservoir pressure to close the cut-oli valve, and means whereby the engineers brake Valve in lap position will ne brake pipe, an engineers bralre yalye,f a

le Y 1,506,343@

per-mit' tbe ent-'eti val-ve to Open 'cornirinnieai tion between the main reservoir and the ceinpensating valve.

An air brake apparatus comprising e brake pipe, ein engineers brake Valve, a mein reservoir, an equaiizing reservoir, a Li ire pipe eoinpenseting vaivelsubjeot to brake pipe pressure opposed. to the pressure o' the equeiizing reservoir nd Contreiiing VCoinininiiesftion betweentbe brake pipe and etinospiiere and between the mein reservoir enel the brake pipe, the equeiizing reservoir pressure tending to open communication between the mein reservoir and the brake pipe und the brake pipe pressure tending to open Communication between the brake pipe and zitinospber e ent-onm valve Controlling coninmnicetion between the main reservoir and tie compensating Valve, e piston connected to seid Valve', a spring operating on one side of said piston and tending to for-ee ytire` cut-ofi' valve to open position, meansfor act ini/ting mein reservoir air to the other side of seid piston to close seid Valve, ineens whereby the engineers Valve in running, service and emergency positions will eX- heust the Aair from one side of said piston to permit seid cnt-ori: Valve to Close, and ineens whereby the engineers brake Valve in lap positionwliii equalize mein reservoir pressure on opposite sides of said piston and thereby perrnit the said spring to open said eut-off valve.

n testimony whereof We hereunto e'iiix our signatures this 29th day of Mey, 1926.

MAURICE E. HAMiLfroN. ,EDWARD r. WiLsoN. 

